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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Sean Hansford / Manchester Eveni/PA Wire
People playing the role of injured shoppers react during an exercise at the Intu Trafford Centre in Trafford, Manchester, where police have joined forces with other agencies during a simulated terror attack to test the emergency response to a major incident.
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)
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Pool via Getty Images
MANCHESTER, ENGLAND - MAY 10: Emergency forces and shoppers take place in a simulated terror attack at the Trafford Centre on 10 May, 2016 in Manchetser, England. Police in Greater Manchester have joined forces with other agencies to carry out a simulated terror attack to test the emergency response to a major incident. (Photo by Sean Hansford/MEN - Pool / Getty Images)